6 
BULLETIN 396, U. 
DEPAETMEXI OF AGEICrXTTTBE. 
nient Station. 1 In nearly all cases the average is for 16 vears. 1S9S- 
1913. inclusive. 
Table V shows that the precipitation at Moccasin is a little higher 
than in eastern Montana, but about the same as that of the central 
and western parts of the State. The locations of the stations for 
which data are given are shown in figure 2. 
Tablz Y. — Average precipitation at 25 stations in Montana, including Moccasin, for the 
16 years (1898 to 1913) 
Foisrth -- 
10 vears (1904 to 1913) 
16 vears (1898 to 1913) 
Billings 
9 vears (1905 to 1913) 
SEE?. 
16 vears (189S to 1913)- 
15 vears (1898 to 1912) 
16 vears (1898 to 1913) - _ 
do 
15 years (1396 to 1910) 
16 vears (1898 to 1913) 
16 years (1898 to 1913) 
Cat Bant 
do 
Kalispdl 
do 
do 
In eastern Montana 14. 23 
In western Montana, 16. 22 
Mo«sisinTl6-year period (1898 to 1913) 16. 46 
EVAPORATION. 
Of the cliniatic factors that influence crop growth, evaporation is 
probably next in importance to seasonal precipitation. Evaporation 
records have been taken at Moccasin since 1909. The evaporation 
is determined from a free water surface, the method being the one 
usually employed where the Biophysical Laboratory of the Bureau 
of Plant Industry is cooperating. 2 
Records are taken during six months. April to September, inclusive. 
In Table VI the evaporation and precipitation in these months are 
1 Burke. E:~ ;:; Prncknev. R. M. Temperature records 1898-1913. An appendix to report 
on Montana climate. Mont. Agr. Exp. Sta. BuL 99, p. 68-143. 1914. 
1 Briggs, L. J., and Beiz. J. O. Dry farming in relation to rainfall and evaporation. U. S. Dept. Agr.. 
Bur. Plant Indus. BuL 1S8, p. 16-20. 1910. 
